As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND CHECKS, "ELEC" LIGHT ILLUMINATED ON THE ELECTRIC METERS, BATTERY AND GALLEY POWER MODULE. BITE CHECK ON POWER MODULE P5-13 INDICATED "SPCU INOP". REPLACED THE STANDBY POWER CONTROL UNIT. OPS CHECK NORMAL AND "ELEC" LIGHT NOT ILLUMINATED.